| Clemmons to Mangualde | 3,835.72 mi (6,172.99 km) |
| Clemmons to Marco de Canavezes | 3,802.80 mi (6,120.01 km) |
| Clemmons to Marinha Grande | 3,798.51 mi (6,113.11 km) |
| Clemmons to Massama | 3,805.83 mi (6,124.89 km) |
| Clemmons to Matosinhos | 3,775.90 mi (6,076.73 km) |
| Clemmons to Mealhada | 3,807.14 mi (6,127.01 km) |
| Clemmons to Melgaco | 3,775.43 mi (6,075.97 km) |
| Clemmons to Melres | 3,793.32 mi (6,104.76 km) |
| Clemmons to Mira | 3,791.97 mi (6,102.58 km) |
| Clemmons to Miranda do Corvo | 3,819.76 mi (6,147.32 km) |
| Clemmons to Mirandela | 3,842.78 mi (6,184.36 km) |
| Clemmons to Mogadouro | 3,869.03 mi (6,226.60 km) |
| Clemmons to Moimenta da Beira | 3,833.87 mi (6,170.02 km) |
| Clemmons to Moita | 3,823.15 mi (6,152.76 km) |
| Clemmons to Moncao | 3,766.10 mi (6,060.95 km) |
